[U-Boot] [PATCH 5/5] RFC: sunxi: WIP FEL support

[Simon Glass]

Hi Hans,

On 4 February 2015 at 01:47, Hans de Goede <hdegoede at redhat.com> wrote:
> Hi,
>
> On 04-02-15 05:18, Simon Glass wrote:
>>
>> (What does FEL stand for?)
>>
>> This is an attempt to make sunxi's FEL code fit with the normal U-Boot
>> boot sequence instead of creating its own.
>>
>> Most of the FEL special-case code is removed, although I may have gone too
>> far with my changes to generate a u-boot-sunxi-with-spl.bin file even when
>> FEL is enabled. This may not be possible since the MMC stack makes SPL
>> too large for FEL anyway, although it may be possible for other boot
>> mediums.
>>
>> This series is available at u-boot-dm, branch sunxi-working.
>
>
> Thanks for working on this, I like the direction where this is heading,
> if Albert is ok with the start.S changes this would be an excellent way
> to fix FEL mode for v2015.04.

OK great!

>
> WRT you going to far when also building a u-boot-sunxi-with-spl.bin when
> FEL is enabled, your right, AFAIK that binary will not work when written
> to sdcard because FEL mode has a CONFIG_SPL_TEXT_BASE of 0x2000 where
> as non FEL has CONFIG_SPL_TEXT_BASE set to 0x0020.
>
> But we've discussed in the past to use 0x2000 everywhere, this would mean
> moving the stack pointer to 0x2000 instead of 0x8000, and then making
> the normal SPL fit between 0x2000 - 0x8000.
>
> All you need to change then AFAIK is tools/mksunxiboot.c so that the jump
> instruction which is the first 32 bit word of the header it generates jumps
> to 0x2000 rather then 0x0020, and then we may be able to have a unified
> build which does both FEL and regular SPL for sdcard boot.

Interesting, I wondered about that.

I see your other series too so this could all fit quite nicely. I'll
focus on getting this series through with Albert's help.

Regards,
Simon